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My dad's 05 AWD Denali Yukon XL Denali makes the same noise. We haven't put it in the shop to check it out yet but are planning on it real soon. If I find something out, I will post it here.
 

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Put my dad's Denali in the shop yesterday. They said the noise we were hearing is bad bearings in the front diff. They are rebuilding it under warranty.
 

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Got the truck back today. They replaced all of the bearings except the pinion bearing because that one was still fine. It drives nice and quiet now.
 

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I don't know if there was a bulletin or not, they didn't tell us. Good luck.
 

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Glad you got it fixed properly. Now just enjoy it.
 
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